Control apparatus



Dec. 16, 1941.

CONTROL APPARATUS Filed May 29, 1940 2 Sheets-Sheet 1 imm I 'j .f5 "HT-"" E H5! f( ff?? 52% l zl i? [nq] s *Il L Dec. 16, 1941. s. A. CROSBY ET AL 2,266,711

CONTROL APPARATUS Filell May 29, 1940 2 Sheets-Sheet 2 Patented Dec. 16, 1941 vCONTROL APPARATUS YStephen A. Crosby and John AQPeStka, Chicago, Ill., assignors to Belmont Radio Corporation, Chicago, Ill., a corporation oi.'y Illinois Application May 29, 1940, serial No. 331,900

y (ci. 74-10) 18 VClaims.

This invention relates tov tuning devices-'for radio apparatus and in particular to automatic tuning devices of a mechanical type in which the force applied to the push button corresponding to a station which is to be tuned, supplies the rotative force for turning the tuning condensers or other frequency changing; means. l

This invention relates to the structure of copending applications Serial No. 343,641 and 348,161, filed July 2, '1940, and July 29, 1940, respectively, which such applications carry the claims dominating the ystructure of the present application. f

One form of the mechanicalA tuning devices of the prior art generally includes'a rotatable treadle bar in operative connection with the tuning' condensers; a linearly movable 'station' selector unit being adapted tomove the treadle bar to effect a movement of the condensers'to a particular predetermined tuning position corresponding to the station identified by the selector unit.` vIn these devices'adjustable cam means are usually-mounted on the selector unit having engaging portions thereon adapted to be moved into engagement with corresponding engaging portions on the treadle bar; the concurrentengagement of* all engaging portions determining the tuning position ofthe condensers. The cam is' generally-locked in its kadjusted positionby screw means threadably secured in the selector units and adapted to effect a frictionalfengage'- ment with the cam to prevent any' moving of the cam fromits adjusted positioni Access to the'adjusting screws is usually provided from the outside of the radio receiver,A the adjustments generally being made by the use of a screw-driver or like means. Considerable difculty and inconvenience is encountered inthe cam adjustment of these prior art devices by virtueof the fact that the selector units must be held in enadjustment is impaired by the tendency of the selector unit to move out of its home position,

so that avfailure to maintain the unit inY positive a engagement with the treadle bar at all times 'during the adjustment operation often results in the setting of the cam at a position other than that which' will provide for the desired tuning condition. y l

, A further disadvantage of theV prior art devices is the poor locking action provided by thejusual screw means. AThe cam is generally of relatively narrow width' and the engaging portions on the cam andrfriction holding means of arcuate contour so that but small frictional surfaces are available for holding the cam in a locked posimany of the adjustments are only of a tempor.

this lack of working space, the accuracy of the.

tion. Any tendency, therefore; for a tilting or canting of one or both of the engaging surfaces relativerto ea'ch other results ina line contact rather than a surface engagement between such surfaces, whereby to appreciably reduce thefric'- tional holdingI pressure. Because. of this fact,

ary nature since the cam isA readily moved out of-its adjusted position after butrelatively few actuations of the selector unit.

An object of this invention, therefore,v is to ,provide an improved control device for controllable apparatus which is particularly adapted for use as an automatic. tuning device for radio receiving apparatus. Q

A further object of this inventionv is to yprovide a positive, simple locking device for a movable element, with the locking being effected asv a resuit of a, wedging action in the locking device.

Another object of this invention is -to provide automatic tuning apparatus in which the station selector units are simply and easily adjusted for a particular tuning condition by the use of spring means. y f

Y A further object of this invention is to provide an automatic tuning device which is of simple, rugged construction and comprised of but few parts'which are readily formedbyA stamping or punching operations so as to be produced commercially at a. minimum of cost.

A feature Vo1' this invention is the provision of an adjustable element'in a control unit, which may be adjusted to a predetermined control position and then locked in suchv position, all bythe use merely of one hand in avery simple operation. I

A further feature of this invention is found in the provision of a tuning device in'which the station selectorv units are completely assembled by an interlocking engagement of the component parts thereof. l f A. Y

Another feature of this invention is found in the provision of a tuning device having an extenfrequency Changing mechanism `ll'lay.

sible selector unit comprised of an actuating and an operating member interlockingly engaged for relative slidable movement. An adjustable cam is mounted on the operating member, and a substantially nat spring arranged between the two interlocked members is adapted on contraction of the unit to a closed position by relative movement of the two members to spread longitudinally and project a locking or holding force at one end toward the cam for locking the cam in its adjusted position.

' A still further feature of this invention is the provision of a tuning device having an extensible selector unit including a locking spring for an adjustable cam, in which the locking spring is normally free of any tension when the unit is in its extended position so as to provide for a free movement of the cam, and which exerts a pressure on the cam to lock it in an adjusted position when the unit is in `a closed position. A wedging action is employed in the lockingy operation of the cam. 1

Yet another feature of this invention is the provision of a'tuning device havinga selector unit including an adjustable cam, in which the cam locking means are adapted to positivelyV hold the cam in'its adjusted position by the direct application thereon of a strong spring force applied over a substantial portion of said cam.

Further objects, features and vadvantages of this invention will become apparent from the following description 'when taken in connection with the accompanying drawings in which:

Fig. 1 is afragmentary plan view of the'invention;

Fig. 2 is a sectional view taken along the line 2-2 of'Flg.1; Fig. 3 is a view illustrated similarlyV to Fig. 2

showing the selector unit in a home position;

' Fig. 4 is a side elevation of a station selector unit showing the arrangement of the parts thereof prior to its adjustment fora particular tuning condition; Y g

Fig. 5is a view illustrated similarly to Fig. 4 showing the selector unit after adjustment has been completed, but prior to locking;

Fig. 6 is an enlarged sectional view taken along the line 6 6 of Fig. 4;

opposite end of the bar (not shown) being suitably rotatably mounted rin the housing or frame structure 21. The treadle bar or rotary controly means 26, as shown in Fig. 2, is in one piece, of hollow construction, and of substantially semicircular section,the substantially diametrically opposed ends 28-and 28 thereof being supported by an integral slotted portion 29. Rotation of the treadle member 26, is obtained by actuation of the tuning knob 24 and also by actuation of the station selector or push button units 3| which are slidably supported in the frame wall portion 32 and bracket member 33.

Each unit 3| Yincludes an actuating member 34 and an operating member 36 which are assembled in an interlocked but slidable engagement. The operating or carriage member 36 (Fig. 9) is of flat irregular shape and is integrally formed with a body portion 31 and an extending finger portion 38; the inner end of the nger being defined by a projecting shoulder 39 and a side 4I of the body portion 31. The portion 31 is formed substantially centrally thereof with inwardly facing L-shaped apertures 42 and a bumped up or lip portion 43, which is arranged between the apertures near one end thereof. Y A bent portion 44 of .substantially T-shape is formedat the end 46 of the body portion 31, the opposite endr41 having an aperture 48 for an adjustable cam 49, which Fig. 1 is a view in perspective of the spring for s locking'the selector unit in its adjusted position;

Fig. 8 is a view in perspective of the push rod, for a selector unit; f

Fig. 9' is a view in perspective of the carriage member for a selector unit; and

Fig. 10 is a side elevational view showing; the assembly o f the push rod and carriage.

The tuning device of vthe invention isillustrated, in Fig'. 1 with representative resonant frequency changing means which includes a tuning condenser I5 having a fixed frame `I6 and a rotatable shaft I1, which is rotatable'throug'h 180 to provide thefull range 'o'fvtuningy The condenser I5 is suitably connected to the radiov receiving set (not shown). The shaft I1 issuitably connected to shaft I8' through coupling means'l9, and the shaft |8 is provided with a gear segment 2| which meshes with a pinion 22 mounted at one end of a tuning shaft 2.3.V Rotawill be explained.n The operating member 34 (Fig. 8) is of substantially at shape and is provided near its end 5I with longitudinally extend-V ing bent or angeportions 62, a substantially T-shaped aperture 53 -being formed between the portions 62. Bent oppositely in direction fromV the portions v62, but also at theend 5|, is a substantially U-shapedportion with legs56 having recesses 51 formedv on theinner sides,Y thereof. A'transve'rse recess 64 extends intermediate the two legs. Y

In the assembly of the actuator unit 3| the leg portions 66 of thevpushV rod or operating, member 34 are positioned inthe portions 68 of the apertures 42 toprovide for their' dovetail engagement 5 with the carriage member 36 in a usual manner,

the .T,shaped portion 44 lbeing dovetailed with member 34 by its initial positioning in the por-l tion 69. of the aperture .53.: This dovetailed engagement, which is clearly shown in Figs. 1 andV 6, provides for a relative longitudinal movement of the members 34 .and 36 so that each unit 3| may be extendedand contractemyet without permitting` the members 34 'and 36 to become disengaged exceptv at the initial assembling position just described. p- .Y Y

. The cam 49,V previously mentioned.. (Fig. 2) is pivotally mounted ona stud or pin 6| which. is journaled in the aperture 48 of the carriage 36. The cam is relatively narrow and of semi-circular section having at diameter portions 62 and 62' arranged on opposite sides of the pivot pin 6|.

yAbutmenta 63 formed at each end of Vthe arcuate portion 64 serve to limit the pivotal movement of the cam about pin 6 by engagementl .with a spring 65, the'apertures 66 formed in the cam adjacent'each abutment 63 serving merely to pilot the punchingdie in the production of the cams 49. ,"The flat spring 65 (Figs. 6 and '1) is slightly artion of the shaft 23 by turning knob 24, tunes'the 7o lcuate in a longitudinal or lengthwise direction condenser I5 to a given frequency, in an obvious manner. It is understood that other types of Vbe substituted for the condenser I6.

The shaft I8 also carries a and formed of anenlarged section 61 and va reduced section 68, which' sections aredeiined by a s Vshoulder portion 69. Although thespring 66 acts to limit the rangular movement of the cam 49, its

treadle bar zathe pnncxpau function is in iocking holding, or re- 49 is mounted on the carriage prior to the inter-l' rvirtue of the entire assemblyvslight movement of the spring 65 relative to the actuator structure is, permitted both longitudinally and transversely when the/members 34 and 36 are in their open position. In this position the cam 49 is entirely free of any frictional pressure as exerted by the Spring `portion 68 spring 65, and is freely movable about its pivot/ point 6|. On moving of the members 34 and 36 into their closed'position, the push rod 34 at the recess 54 slides on 'the spring 65 to urge the spring laterally with somewhat of a wedging action between such spring and the carriage member 36. With the longitudinal displacement of the spring 65 being limited by a lug 43 and cam 49, this action of the push rod 34 provides for the exertion of a spring pressure both longitudinally and laterally of the spring. the longitudinal displacement of the spring being less than its lateral displacement so that the spring acts as a toggle to apply a magnied loading pressure on'the adjustable cam 49, whereby to frictionally lock the cam 49 in the angular position which it has at the vtime the members 34 and 36 are being closed. That is, the longitudinal movement of the member 34 relative to the member 36 in engagement with one side of the bowed unit, or spring 65, applies a pressure to the same intermediate its ends tending to straighten or flatten it and apply pressure .endwise from the point engaged. The pressure against the member 49increases during the flattening yso that it finally locks or holds the member 49 firmly in a particular predetermined position.

I Because of the slight longitudinal and transverse play of the spring 65 relative to its mount# ing prior to the moving ofthe members 34 and 36 to their closed position, the initiation of the clamping or wedging action acts iirst'to seat the arcuate spring portion 1| nrmly against the cam surface 64 before the exertion of any pressure resulting from 'the toggle action of the spring. A

rpositive and flush engagement is thus obtained position with reference to the apertures 58, and

hencel denne the vclosed position of the' unit 3|. The cam 49, is released from its locked position 'simply by pulling the member 34 outwardly relative to the member 36 to its open position. in which position (Fig. 6) the spring 6 5 is permitted to bow outwardly and the tensionis removed. The limit of this movement is attained upon engagement of the lug 44 andedge of the narrow endy of the aperture 53. In production the cam locking "assembly of the carriage and the push rogl. Anactuating button 12 issecurely mounted upon theend 13 of the push rod, and such button can be pulledr upon to/extend the push rod 34 as well asfpushed upon to move the entire unit 3 If it is desired to disassemble a unit3| for any reason this is accomplished in exact reverse order as to theelements of the units as compared to the assembly' thereof. With the unit in the posi' tion of Fig. 6, the spring 66-isffted out of position, and the rod 34 moved toward the cam until the legs 56 are aligned with the apertures 58, and thev lug 44-'a1igned with the portier-r 59 of the aperture 53. The mounting-,for each unit in the frame for the control apparatus will normally prevent this disassembly after the complete apparatus has been put in operating condition.

Each unit 3| (Fig. 2) is assembled in the frame 21 by location of the iinger 38 in avslot 14 formed Yin the bracket 33, the side 16 of the carriage body` portion 31 beingpositioned in a recess 11 provided in the panel 32, with the opposite side 18 thereofsupported inf a guiding slot 19 `formed in a retaining plate 8|! which is attached to the frame 21. 'I'he unit is thus slidably supported to provide for'linear movement of the unit and hence of the cam 49 into engagement with the treadle bar 26. A y

The normaloperation of the selector unit in providing for the turning of the treadle bar 26 and hence of the condenser unit I5 to a predetermined tuning position' is best understood from Figs. 2 and 3; the cam 49, carriage 36 and push rod 34 being in theirflocked positions. vAs indicated in Fig. 2, the cam 49 and bar 26 are shown as being inclined toward each other with the engaging portions 28 and 62' closer together than the engaging portions Z8 and 62. vThus on actuation of the unit 3| the portions l28 and 62' are rst brought into engagement, the' continued linear movement of the unit 3| eiecting a counter-clockwise rotation of the bar 26 until er1--` gagement is made between the portions 28 and 62, as shown in Fig. 3. The engagement of both pairs of corresponding portions 28 and 62, and 28 and 62' represents the home or tuned position of thel unit. The radio receiver is thus tuned from the condenser setting. indicated by the position of the treadle barin Fig. 2 tothe changed setting shown in Fig. y3, the selector unit after release being returned to its idle position by the action of the coil spring 8|, which is mountedon the nger 38 and arranged incompression between the bracket 33 and the projec- Y tion 39 and side portion 4| of the body portion 31. This action of the unit is similar for any relative positioning of the bar 26 and the cam '49,' theengagement of the corresponding engaging portions on the bar and the cam nearesttogether at the start of unit actuation serving to rotate the bar 26A in a direction and to a position at whichv the face edges of the cam are bothin .engagement with the corresponding face edges 28 and 28 of the treadle bar.

In other words, the selector unit is* always pushed inwardly tothe same longitudinal position when the condenser is in a tuned position, and the treadle vbar and cam are in ilush engagement at this position, but at such tuned position the angular position of the treadle and cam faces `will vary in accordance with the particular frequency being tuned in with the condenser. Dur` Ving this normal operation of the unit it is vto be understood that the selector unit is in its contracted position wih the cam 34 and 36 locked in a relatively ixed position the pressure exerted by the spring 65. l

In the adjustment oi' the cam 49 to set it to a predetermined angular tuning position, the station selector 3| is extended with the members 34 release such members and the cam 49 from the loci-:insr pressure exerted by the spring 65, this unit arrangement being shown in Figs. 4 and 6. The treadle bar 26 is turned to a particular tuning position by operation of the tuning knob 24, the treadle being heid in such position by the normal condenser load applied on the shaft I8. Normally an appropriate tuning scale is provided to indicate the position of the treadle bar. It is contemplated that the teeth oi the segment 2| and of the pinion 22 be of V-type so as to reduce to a minimum the occurrence of any back lash therebetween, and the segment 2| isalso under slight spring tension. The condenser I5 is thus readily and accurately tuned by adjustment of the knob 24. On the application of manual pressure on the push rod 34 at the button 12, the initial friction between the rod 34 and the spring 65 is sufficient to provide for a concurrent linear travel of both the push rod 34 and the carriage 36 against thepressure of the spring 8|, On engagement of ,the cam portion 62 with the bar portion 28', the cam 49, by virtue of its free pivotal movement when the members 34 and 36 are in their open position as was previously fully described, is rotated angularly. The bar 26 meanwhile remains immovable and in the tuning position obtained by manipulation of the tuning knob as just described. This rotation of the cam is continued until the corresponding portions 28 and 62, on the bar and cam, respectively, are also brought into-engagement. In this position the carriage 36 is positively stopped due to the fact that the axis of the treadle bar and the longitudinal axis of the unit 3| are in the same horizontal plane, so that the continued application of pressure on the push rod 34 effects a linear movement only of the push rod relative to the carriage. This movement slides the face of the recess 54 over the spring, and serves to clamp the spring 65 between the rod 34 and carriage 36. As Wasexplained, the initial moving of the rod 34 relative to the carriage 36 acts rst to align or seat the portion 1| of the spring with the portion 64 on the cam, so that a flush and positive engagement is provided between these portions prior to the actual application of any spring pressure on the cam. The movement of the push rod continues until engagement thereof is effected with the shoulder portion 69 on the spring 65, which engagement occurs when the selector unit 3| is in its home position as indicated in Fig. 5. The push rod, carriage, and cam are thus securely locked by the spring in a relatively iixed position, representing the contracted position of the selector unit 3|, with the cam particular tuning position of the bar 26 as set by the operation of the tuning knob 24. During this actuation of the unit 3| the tuning knob 24 remains untouched and the radio operator need only use one hand in all of the manipulations of the selector unit 3l described, with the treadle bar and the associated condenser unit |5 supplying all of the necessary reaction to the adjusing forces to make the desired adjustments possible.

On release of the push rod 34, the selector unit 49 and members by and 36 in an open position, whereby to` 49 being adjusted to the 3| in. its contracted position is returned to its starting or idle position by the return spring 8|. Later actuation of the unit will thus rotate the bar 26 from any position which it might have to a position corresponding with the angular adjustment of the cam 49 to tune in a desired predetermined station. As has been described, release of the cam 49 to permit angular adjustment lor setting to a different station or control position is obtained by merely pulling on the push rod 34 in a direction toward the right, as viewed in Fig. 2, away from the treadle bar 26. The e gagement of the abutments 63 on the cam 49 with the spring section 61, limits the angular rotation of the cam relative to the spring to prevent the cam from rotating into a. position which would prevent a full surface engagement between the cam surface 64 and spring face 1|. The shoulders or abutments 63 are spaced a distance apart to permit an angular rotation of the cam which is slightly greater than the normal angular rotation of the treadle bar for covering the tuning range of the frequency changing means.

The invention thus provides for a. tuning or control device which is comprised of but few parts of simple construction adapted for ready and cheap production in large quantities. TheV complete assembly oi a selector unit by an interlocking or dovetail engagement of all of the 'component parts thereof, provides for a further reduction in manufacturing costs by the complete elimination of screws, nuts and similar securing means, and the saving of time required for the assembly. The accurate adjustment and positive llocking of the adjustable cam for the station selector unit by the'use of spring means insures peak ltuning upon each operation of a selector unit. In addition all setting and operating manipulations of the selector unit can be readily accomplished with one hand, and without the use olf supplementary tools.

Although the invention has been described with reference to a preferred embodiment only, it is to be understood that modifications and alterations thereof can be made which are within the full intended scope of the invention as dened by the appended claims.i

We claim:

l. In radio control means having rotary tuning means, an extensible station selector unit adapted when in contracted position to rotate said tuning means, said unit including a pair of relatively extensible members, an adjustable element supported on one of said two extensible members selectively engageable with the rotary tuning means, means for normally maintaining said two members in slidable extensible relation, and holding means supported on one of said extensible members having a raised portion, said holding means engageable by and adapted to be substantially straightened by the other of said members upon sliding contraction of said two members so as to move at least one end thereof lengthwise, with said holding means in its substantially straightened position engaging saidA adjustable element in the contracted position of said members to releasably hold said adjustable element against angular movement relative to said unit.

2. In control apparatus having movable control means, a selector unit for moving said control means to predetermined control positions including a pair of relatively movablemembers with one of said members having an adjustable driving element thereon, means for normally preventing lateral disconnection of said twomembers but permitting relative /slidable' movement lengthing position with reference to said adjustable Wise of the unit, alwed spring normally retained .mfans when said push member andy carriage are at one endagainst longitudinal movement. rela-'- /in a second position. o

tive to said one member and movable at th'e other A 6. In control apparatus vhaving movable control end into frictional engagement"with,said'driving-` 5 means, 'selector means for moving. saidpontrol element,'said spring being normally retained ,on` means to a predetermined controll position insaid one member -bysaid other member, wthsaid blinding. an interconnected but-'relatively `slidable spring upon', slidable movement of saidzother carriageportion andfan f'extensible-portion, .an

member being urgedflaterally by said othe'ri'mem' Y; t' adjustable member supported on. saidj carriage ber andextended. longitudinally in. at least the 10 portion; a unit on said carriage portion for initidirectionltoward said driving element ar'lde'engag- Aatiilg'aholding ,force vfor ,said adjustable member, ing said driving ``element,'ani'1` frietioriallyvretainemeanson' said. carriage ,portionfor limiting the mg said'drivingelement against angular'movev-Q movement of at lea'sta portion of said unit in one ment. i g I n* l direction, said extensible portionbeing positioned `3. In control apparatusl having; movable-control ,1'5 .'*with referenooto, said u nltto limit .the'movement means, the. combination oiiframe meansafs`elecx "of another. portionjthereoflnanotherv direction, tor unit movablymoilllteduporsiiitlffranmeansr and with'x'said extensible portionbeirlgA movable for movement toward and, away from'said lcon-frv itwardsaid adjustable'member and engaging said trol means, said selector unit lineludimg an'oper: unit during sucirmovement t0 laterally Adisplace (ating member', v2,1, driving` membery gdjustably 20' ysaid another portionofLsaid'unit and extend said mountedonsaidoperatingimember,anactuating. unit bly-,saidlateraldisplacementintoeoperative memberon said operating member, means conengagement with saidadjustable-member to re- ,necting said Operatingjmember andsaidfactuatf, :leasablyhold/ said adJustable membery in an ading member but permitting vrelative slidable .iusted position, `said/unit in adjustable member movement between said members, and means to f'holdmg Position RISP tfiietlerieiiy ,retaining Said releasably retain said driving member in lan ad- 'Carriage and extensible DOI'iOIiS'egaiIiSi relative justed position andreleasablyjretainsaidactuatg s. mevemenih.

bowed unit, on said gpe'ratmgmemb in'A engage..z30 trol Imea-ns including two relatively x'noi'iable teleo ment therewith end extensible lengthwiseoftho scoped units, adjustable means 0n one of said! operating member in 'onedirection' for operativellntSi-.and hOldrlg means operatively eenneeied connection with said drivingfmemberto. retain "vjwith Said-ladiustable means, said holding means the driving momberin adjusted positionwithsaid l including a portin raised yfrom a straight-line actuating member in engagement with andurgi'gl aY position when lthe adjustable means -is movable said bowed unit laterally at one portion thereof` for 9d-lusfinelli'f end. dePreS-Sible toward *a to extend said'bowed, unit andsaid bowed unit, vstraight-line positionl to move one end .thereof i ing means, yand releasable means" operatively con adjustablemeans xed when theunit is in a contracted position and movingouty 'of a retaining i connectedV withsaid adjustable means mounted I ing means having axp'ortion expandibleand coli-*E70 y tr'actible longitudinally'roflsaidiinit toward endl..

in its extended position providing" a holding forceR iieligihwise 'and Provide .of holding ,fr-C? f01 Said for releasably holding said interconnected aotu-` adlllstable'meanslfor. xme the Same 11i an adating and operating members against 'relativelu in stod posmoniwith one of solo umts'engagng movement f y n l vsaid portion and movable relative thereto to depresssaid portion in movement in one direction 4. In radio tuning means having rotarytuning* l means, an extensible station selector unit adapted and penny; th? ,raismg thereof m movement m the opposite direction.

to rotatesaidtuning means when in a ycontracted position, adjustable means -supportedonsaidunit and 'operatively `vengageablev with"saldirotarytunf a means, '-the means g for` vactuating t said-A vrotary means including a lpair, of 'relatively movable units, adjustablemeans on one ofA said'funits, and means for normally frictionally retaining said s0'.,adjustablem'eans in anadjusted position having "'an. endg portiongoperatively connected lwith said adjustable A rri'eans and another end portion posicned intermediate said ytllvo units with a depressible portion intermediate saidftwo endv portions,

nected with said .adjustableymeanfs'to retaini'sai position relative t0 sagi'd adjustable means-When" said unit is in. anextendeclpojsiti'on,l vsaid"ieleasable means .having'fat least:onevv portion 'which is raised laterally from astraight-line position when".y A ,o l u l the unitisl iii-1an extended position' snddepressed r .Wilh ihefothor'lmli .heme moloole 19o/Salo me substantially to a; straight-line 'positionin the' om @Yer a Dorion??? Sadeiommg moans arid 1. engaging vthe same in a manner to depress said portion Whenthe'o'ther unit is in one position,

contractedpostionrofthe unit.-

`. i 5. In radio tuning'iapparatusfhaving rotatable'l tuning means,1a :station selector .unit for rotatingv said tuning means'andincluding afca'rriage and v60, i a push member in movable*interlookedfengagemeans r-enoemg; fsa/1da.lustablgmeo'nstaton' ment with said carriage, said push member' a nd v l' ang Whlf Salfi, itlrmede pgri'lon 1s dlgesed carriage being ielativelymovableto atleast two en Sa, edles? .mns" el?? mov@ e 9T different positions, adjustablemeansimount'ed on ',adfmstment ,Whoo Sold fmtlm? late' portion 1s said carriage and Aedaptedffor.-o'onjheotlon with Egel L n *g said tuning means, vholding means-operatively .n Control apparatus along, rotary, Control ineans', the means 'for actuating said 'rotary control means including in combination'two'relatively. movable o interconnected -i`l'x1its; vadjustable l"r'nean's' onf. one, of; said" units "normally retained member is in another' position,-said retaining in said unit on said carriage and retained thereon' by means including saidpushmembenjsaid hold-l i f stationaryv in af adjusted position,,and means away fromisaid adjustable means 'andobeihg in t l, sunprtedinte'rmediat said .two units andin en- .ing and operating members; against relative slid# "i G7#- *Ineentrei apparatus .livinsirtarygcontrol *able movementzsaid/{r'etaining' means inclndinga means;theimean'forzaotuatins 'Said rotary con? v 8. AIn controlappar'atus 'havingrotary controlvvv vith Vsai'dpo'rtion. being' raised when said second non-holding 'position with reference tosaidad; gagernent with eachv operativeliI conneeted Vatene justable means when said carriage and push end with said adjustable means. and having a member are in one position, and being in a hold-V 75 raised portion when the adjustable `means is in a movable condition, means for limiting the movement of said supported means lengthwise of said one unit at the other end, with said other unit being movable over said raised portion and depressing the same to extend said one end thereon lengthwise and provide a retaining force for the adjustable means to retain it stationary in an adjusted position.

10. In control apparatus having rotary control means, actuating means for said rotary control means including a supporting unit, an adjustable member mounted on said unit, means on said unit extending longitudinally thereon operatively connected at one end with said adjustable member and movable at one portion in a direction into and out of a substantially straight-line position for said means, a movable member mounted on said unit in engagement with said means and movable thereover to apply pressure to said means when it is out of a substantially straightline position with such pressure tending to straighten the same, a stop at the other end of said means, With said adjustable member and said stop experiencing a pressure exerted endwise by said means which increases as said movable member is moved over said means in the straightening action.

11. In control apparatus having rotary control means, the means for actuating said rotary control means including the combination of a pair of relatively movable interconnected units, adjustable means mounted on one of said units, friction holding means operatively connectible with said adjustable means including means supported on said one unit and normally raised out of a straight-line position in non-holding position, with one end portion of said supported means positioned intermediate said two units and having the other of said units in operative engagement therewith, said other unit being slidable toward said adjustable means and acting on said supported means in a manner to depress the same toward a straight-line position as it moves toward said adjustable means and extend one end of said supported means toward said adjustable means to provide a holding force therefor.

12. In control apparatus having rotary control means, the means for actuating said rotary means including in combination adjustable means operatively connected with said rotary control means, a rst unit supporting said adjustable means, a second unitsupported on said first unit and movable relative to said first unit having means guiding such relative movement, a bowed unit operatively connected at one end'iwith said adjustable means and having a peak portion intermediate the ends in one position of said bowed unit, and a stop on said rst unitat the other end of the bowed unit, with -said bowed unit supported on said slidable unit in a position such that the portion adjacent thesto'p li'es beneath a portion of the second unit, and with the second unit being movable lover said peak portion to depress said portion and extend said one end toward said adjustable means to provide a holding force to maintain said adjustable means station-- ary.

13. In control apparatus having movable control means, a control position selector unit for moving said control means including movable supporting means, adjustable means mounted on said supporting means, and holding means for said adjustable means having one portion with a part thereof raised laterally from a substantially straight-line position when the adjustable means 'j is free to be adjusted and movable means malntained on said supporting means operatively engageable with said one portion and movable intermediate a holding position and a non-holding position, with said portion being operatively connectible with said adjustable means, and'with the movable means upon movement relative to said supporting means from a non-holding position to a holding position urging said part toward a substantially' straight-line position to provide a holding force for application to said adjustable means to maintain it releasably fixed against adjustment.

i4. In radio tuning apparatus having rotatable tuning means, a station selector unit for the tuning means movable between two stop positions, said unit including supporting means, iinger operated means onsaid supporting means and longitudinally'slidable relative thereto, adjustable means mounted on said supporting means, and friction applying means `operatively connected with -said adjustable means mounted in said unit on said supporting means and retained thereon by means including said nger operated means, said friction applying means having a portion expandible and contractible longitudinally of said unit toward and away from said adjustable means, said nger operated means adapted to be pulled slidably outwardly relative to said supporting means when said unit is at one stop position to permit said portion to contract longitudinally to remove the holding friction from the adjustable means, and said finger operated means adapted to be pushed slidably inwardly relative to said supporting means when said unit is in the other stop position and acting to expand said portion longitudinally upon said slidon said face thereof and movable relative to said` supporting means, said movable means in one operating position permitting said spring to bow laterally to remove a holding force from said adjustable means, and being movable to another operating position and urging said spring toward a substantially straight-line position on said movement to provide a holding force for -said adjustable means.

16. A control unit for controllable apparatus including a pair of movably interlocked members, adjustable meanson one of said members, with the other member being non-rotatably longitudinally movable relative to said one member in one longitudinal direction to release the adjustable means and in the opposite direction to effect a holding of said adjustable means, means operatively connecting said adjustable means and said other member including a resilient portion movable laterally relative to said one member upon andsaidfextending yportion having another part lmembers 4beingA flat over the greater portion thereof,adjustable means on oneof said'members, rholding means adapted Iselectivelyy to be in a holdingpositionand in a nonholding position forsaid adjustablefrmeans supported upon said yone member-and operatively connecting said other memberandsaid adjustable means, said holding' means including'a relatively ilat spring having a. portion movable laterally when the` l holding means is changed-from one of said posi.-

tionsto the other,V and withsaid-onemember Y havingv'anopening thereimsaidxother member havingaportionfextendingsubstantially at right angles'-l thereto' withLa part thereon 1movable in said opening and an outstanding `earf'onkr said partpositioned over said one' member nadjacent said opening on oneside Aof .said'one member,

on'th'e other lside of said one member operatively connected with saidr holding vmeans when said holdingv vmeans is yin" hvoldingfposition.y A

18.y Alunmg'fcontrolxunit for radio apparatus including a pair ofxinterconnected but relatively movable members, adjustable-means on*v onev of i said members, and holding meansfoperatively connecting the other member of vsaidy pair and said adjustable means, said holding j means 'in-v cludinggaqrelatvely fiat spring and adaptedfto be selectivelyv in a holding and in a nonholdi`ng position for said adjustable means, means supporting said spring upon said one member. said spring Lha'ving*v a portion Amovable 'laterally' when the holdingfmeansv-is changed from' one 'of said positions to the other, andwith said 'other mem; j

ber being movable. relative to said one member to effect-said lateral movement of said portion of said spring.' i

f j 'STEPHEN A. CROSBY.

' ";J0HN.A. PEs'rKA. 

